Graham recently posted an Instagram video of her sweat sesh at trendy New York City gym Dogpound with kiddos, as part of the nonprofit Community of Unity. Instead of sticking with regular squats, though, she modified with a resistance band, which not only helps with sticking to great form, but also fires up the muscles for an even more killer workout.

“The obvious benefit is increased resistance, especially on the outer thighs,” Kristine Storie, owner of Xtend Barre Brooklyn, told Self. “The use of the band during squats will help to establish and maintain proper knee alignment, which is essential for performing a squat safely.”

When using a resistance band during squats, Storie said there are two areas to focus on: You’ll want to make sure your knees aren’t caving in, lining them up with your second and third toe as you squat down. (If you’re doing things properly, your band should stay tight.) Also, make sure your knees stay right over your ankles, keeping your shin bone at a 90-degree angle.

“The use of the band during squats will help to establish and maintain proper knee alignment, which is essential for performing a squat safely.” —Kristine Storie, owner of Xtend Barre Brooklyn

Now that your bottom half is covered, don’t forget to pay attention to your spine: “Maintain the natural shape of the spine throughout the squat,” Storie said, noting that it won’t be straight, but will have a slight curve.